We should think of [ ] old and [ ] sick A a,a B an ,a C the,the D/,/
问题描述:
We should think of [ ] old and [ ] sick A a,a B an ,a C the,the D/,/
RT说明原因
答
C the; the
the+形容词表示有此类特征的人,如the old老人,the sick病人